Bielschowskysin (1) is a naturally occurring regular diterpene isolated from the Caribbean gorgonian octocoral Pseudopterogorgia kallos. Its highly oxygenated hexacyclic structure possesses several unusual stuctural features. In addition to having two cyclic hemiacetals, a g -lactone, and a tetrasubstituted cyclobutane moeities, bielschowskysin (1) is based on a previously undescribed tricyclo[9.3.0.0^2,10]tetradecane ring system whose structure was established through spectroscopic analysis and X-ray crystallographic analysis. Bielschowskysin (1) was shown to exhibit strong antimalarial activity against Plasmodium falciparum.

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